INSECUTOR INSClTIyE MENSTRUUS 143 



NEW SPECIES OF ERIOPTERINE CRANE-FLIES 

 FROM THE UNITED STATES 



(TipulidcB, Diptera) 



By CHARLES P. ALEXANDER 

 Ormosia bifidaria, new species. 



Closest to O. fmnata (Doane) ; antennae dark throughout; 

 thorax clear gray ; gonapophyses of the male hypopygium 

 slender, each with a deep apical notch. 



Male. — Length, 4.5-4.8 mm. ; wing, 5.5-5.8 mm. 



Female. — Length, G-6.3 mm. ; wing, 6.8-7.3 mm. 



Rostrum and palpi dark brown. Antennae dark brownish 

 black throughout. Head light brownish gray. 



Mesonotum gray without distinct stripes. Pleura clear blue- 

 gray. Wings subhyaline or with a faint gray tinge ; stigma 

 brown ; small indistinct clouds along the cord and outer end 

 of cell 1st Mo,' veins dark brown. Venation : Cell ist M^ 

 closed ; basal deflection of Cu^ just beyond the fork of M ; 2nd 

 Anal vein strongly sinuate. 



Abdomen dark brown ; hypopygium bright yellow. Male 

 hypopygium with the pleurites stout. Outer pleural appendage 

 broad, expanded outwardly, flattened, the outer margin con- 

 cave, heavily chitinized and minutely denticulate. Inner pleural 

 appendage a flattened yellowish lobe. Penis-guard at its apex 

 split into two strongly divergent horns. Gonapophyses slender, 

 straight, each with a deep V-shaped apical notch. 



The female is generally similar to the male but is conspicu- 

 ously larger ; the ovipositor is bright reddish yellow, shiny. 



Habitat. — Colorado. 



Holotype, $ , Platte Canyon, altitude 10,000 feet ; August 

 21, 1915 (E. J. Oslar). 



Allotopotype, 9 . 



Paratopotypes, 2 5 's, 6 9 's. 



Type in the collection of the author. 



0. bifidaria is closest to O. fumata (Doane) which differs 

 in having the basal antennal segments pale, the coloration not 

 clear gray, and in the very different structure of the gonapo- 

 physes of the male hypopygium. 



